The pump has about 6ft of wire, their is additional 5ft or so from the controller to the pump. Be very careful with such a large reservoir. You cannot pump downhill, so the hose will have to end above the height of this reservoir or water will continue to siphon after the pump turns off. Reservoir volume is the final safety if every other safety were to fail, and no safety can defeat a siphon except proper installation. Personally, I would never have more water available to a top off than I would need in 7-14 days.